Enter MRNP through White River entrance, drive towards Sunrise and park at Sunrise Point TR. Take trail past Clover Lake, after another mile look for the trail to Hidden Lake which turns to the West (marked), hike up to Hidden Lake, continue around South side and up steep unmaintained trail to saddle between Marcus & Palisades. Continue East until past the scrub trees.
For Palisades, shoot for easier going in clearings, head uphill a bit West of summit, will find a faint climbers trail that bypasses most brush. Once on ridge, continue NE to true summit.
For Marcus, stay below brush taking first gulley to the ridge (heather and rock), follow ridge to summit block, route is obvious on NE face.
Can add Slide to same trip, continue on main trail to saddle between Palisades and Brown, climbers trail goes up Brown and runs the ridge to Slide. Combined 3 peaks is about 9 hour trip.
Meeting POint = Palisades Lake TH - AKA Sunrise View Point / Hairpin.
South Slide and Brown could be added on depending on the group.